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Add overall alpha acceleration using mask surface

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David Reveman 2005-03-03 18:46:49 +00:00
parent 50b5344d7d
commit 01b87c7d99
3 changed files with 91 additions and 8 deletions
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3
ChangeLog
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@ -1,6 +1,9 @@
2005-03-04 David Reveman <davidr@novell.com>
* src/cairo_pattern.c:
(_cairo_pattern_acquire_surfaces): Add overall alpha acceleration
using mask surface.
* src/cairoint.h:
Add convenience function _cairo_pattern_acquire_surfaces.

48
src/cairo-pattern.c
View file

@ -1129,21 +1129,61 @@ _cairo_pattern_acquire_surfaces (cairo_pattern_t *src,
cairo_surface_attributes_t *src_attributes,
cairo_surface_attributes_t *mask_attributes)
{
cairo_int_status_t status;
cairo_int_status_t status;
cairo_pattern_union_t tmp;
double src_alpha, mask_alpha;
status = _cairo_pattern_acquire_surface (src, dst,
if (src->type == CAIRO_PATTERN_SURFACE)
{
if (mask)
mask_alpha = mask->alpha * src->alpha;
else
mask_alpha = src->alpha;
src_alpha = 1.0;
}
else
{
if (mask)
{
src_alpha = mask->alpha * src->alpha;
if (mask->type == CAIRO_PATTERN_SOLID)
mask = NULL;
} else
src_alpha = src->alpha;
mask_alpha = 1.0;
}
_cairo_pattern_init_copy (&tmp.base, src);
_cairo_pattern_set_alpha (&tmp.base, src_alpha);
status = _cairo_pattern_acquire_surface (&tmp.base, dst,
src_x, src_y,
width, height,
src_out, src_attributes);
_cairo_pattern_fini (&tmp.base);
if (status)
return status;
if (mask)
if (mask || mask_alpha != 1.0)
{
status = _cairo_pattern_acquire_surface (mask, dst,
if (mask)
_cairo_pattern_init_copy (&tmp.base, mask);
else
_cairo_pattern_init_solid (&tmp.solid, 0.0, 0.0, 0.0);
_cairo_pattern_set_alpha (&tmp.base, mask_alpha);
status = _cairo_pattern_acquire_surface (&tmp.base, dst,
mask_x, mask_y,
width, height,
mask_out, mask_attributes);
_cairo_pattern_fini (&tmp.base);
if (status)
{
_cairo_pattern_release_surface (dst, *src_out, src_attributes);

48
src/cairo_pattern.c
View file

@ -1129,21 +1129,61 @@ _cairo_pattern_acquire_surfaces (cairo_pattern_t *src,
cairo_surface_attributes_t *src_attributes,
cairo_surface_attributes_t *mask_attributes)
{
cairo_int_status_t status;
cairo_int_status_t status;
cairo_pattern_union_t tmp;
double src_alpha, mask_alpha;
status = _cairo_pattern_acquire_surface (src, dst,
if (src->type == CAIRO_PATTERN_SURFACE)
{
if (mask)
mask_alpha = mask->alpha * src->alpha;
else
mask_alpha = src->alpha;
src_alpha = 1.0;
}
else
{
if (mask)
{
src_alpha = mask->alpha * src->alpha;
if (mask->type == CAIRO_PATTERN_SOLID)
mask = NULL;
} else
src_alpha = src->alpha;
mask_alpha = 1.0;
}
_cairo_pattern_init_copy (&tmp.base, src);
_cairo_pattern_set_alpha (&tmp.base, src_alpha);
status = _cairo_pattern_acquire_surface (&tmp.base, dst,
src_x, src_y,
width, height,
src_out, src_attributes);
_cairo_pattern_fini (&tmp.base);
if (status)
return status;
if (mask)
if (mask || mask_alpha != 1.0)
{
status = _cairo_pattern_acquire_surface (mask, dst,
if (mask)
_cairo_pattern_init_copy (&tmp.base, mask);
else
_cairo_pattern_init_solid (&tmp.solid, 0.0, 0.0, 0.0);
_cairo_pattern_set_alpha (&tmp.base, mask_alpha);
status = _cairo_pattern_acquire_surface (&tmp.base, dst,
mask_x, mask_y,
width, height,
mask_out, mask_attributes);
_cairo_pattern_fini (&tmp.base);
if (status)
{
_cairo_pattern_release_surface (dst, *src_out, src_attributes);